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#include<iostream> 
using namespace std; 
int main(){ 
    int n,s=0; cin >> n; 
    int q; 
    for(int i = 0;i < n;i++){
    cin >> q; 
    if(q == 1)s++;
    }
    if(s >= 2){ 
       cout <<'0'<<'\n'<<'2'<<'\n'<<'1'<<" "<<'2'; }
    else if(s==1) 
        cout<<1<<'\n'<<'2'<<'\n'<<'1'<<" "<<'2';
    else 
    cout << 2 <<'\n'<<'2'<<'\n'<<'1'<<" "<<'2'; 
}